Basal cell carcinoma with perineural invasion: A prospective study examining subtype, tumor surface diameter, invasion depth, and anatomic site in 3005 consecutive cases.

Increases in percentage infiltrative subtype within the tumor mass, microscopic tumor diameter, tumor invasion depth, and BCC cases per patient all recorded more PNI. Minimum invasion depths with PNI were 1.0 mm on males (nose) and 1.0 mm females (forehead).